#!/usr/bin/env python

import argparse
import copy
import os
import pathlib
import shutil

import bs4
import markdown


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("src", help="source directory", nargs="?", default="./src")
    parser.add_argument("out", help="output directory", nargs="?", default="./out")
    args = parser.parse_args()

    src = pathlib.Path(args.src).absolute()
    out = pathlib.Path(args.out).absolute()

    md = markdown.Markdown(extensions=["attr_list", "meta"])

    # Clean the output directory
    if out.exists():
        print("Removing  ", out)
        shutil.rmtree(out)

    # Load the template
    template = bs4.BeautifulSoup(
        (src / ".template.html").read_text(encoding="utf8"),
        features="html.parser")

    # cd to src so os.walk(.) returns paths relative to src
    os.chdir(src)
    for dirpath, dirnames, filenames in os.walk("."):
        for filename in filenames:
            if filename[0] == ".":
                continue  # Skip dotfiles

            # Future-proofing
            if not filename.endswith(".html") and not filename.endswith(".md"):
                raise Exception("Support for this filetype is not yet supported:", filename)

            path = src / dirpath / filename
            dest = out / dirpath / filename
            os.makedirs(dest.parent, exist_ok=True)

            content = path.read_text(encoding="utf8")
            meta = {}

            # Preprocess markdown into html
            if dest.name.endswith(".md"):
                print("Converting", path)
                dest = dest.with_suffix(".html")
                content = md.convert(content)
                meta = md.Meta

            # Inject content into the template
            page_content = bs4.BeautifulSoup(content, features="html.parser")
            page = copy.copy(template)
            article = page.new_tag("article")
            article.append(page_content)
            page.article.replace_with(article)

            # Apply metadata to the template
            if meta_title := meta.get("title"):
                title = "".join(meta_title)
                page.title.string = title
                page.header.h1.string = title

            # Write the destination file
            print("Writing   ", dest)
            dest.write_text(str(page))


if __name__ == "__main__":
    main()